Jsr Corporation

Toshihiro Nishimura

Minoru Tanaka

Fumio Tsutsumi

Yutaka Abe

Toshiyuki Hayakawa

Shoei Tsuji

Motoharu Higuchi

Katsumi Oka

An (meth)acryloyl group-modified ethylene-&agr;-olefin copolymer (A) which has (meth)acryloyl group as a the side-chain thereof, wherein the intrinsic viscosity &lsqb;&eegr;&rsqb; was 0.01 to 10 dl/g measured in decalin at a temperature of 135&deg; C.; and a rubber composition which comprises said (meth)acryloyl group-modified ethylene-&agr;-olefin copolymer, a vulcanizing agent, and/or a crosslinking agent; in addition, a liquid curable rubber composition which comprises, component (A), reactive diluent (D), and if necessary, photopolymerization initiator (E).

(Meth)acryloyl group-modified ethylene-alpha-olefin copolymer, production method thereof and rubber composition

A rubber composition comprising (a) a low molecular weight copolymer rubber which is an ethylene/&agr;-olefin/non-conjugated diene copolymer rubber having a limiting viscosity &lsqb;&eegr;&rsqb; of 0.4-1.6 dl/g measured in decalin at 135&deg; C., and an ethylene content of 40-60 wt % and (b) a high molecular weight copolymer rubber which is an ethylene/&agr;-olefin/non-conjugated diene copolymer rubber having a Mooney viscosity (ML ,100&deg; C.) of 60-150, an ethylene content of 60-80 wt %, and an iodine number of 5-35, wherein the difference between the iodine number of the low molecular weight copolymer rubber (a) and the iodine number of the high molecular weight copolymer rubber (b) is 5 or less and the ratio by weight of the low molecular weight copolymer rubber (a) and the high molecular weight copolymer rubber (b) is 50/50 to 80/20, the rubber composition having a Mooney viscosity (ML ,100&deg; C.) of 20-50. The rubber composition exhibits superior roll processability and extrusion processability, excellent surface appearance and adhesiveness, can be processed easily, and produces vulcanized rubber exhibiting excellent mechanical characteristics and good low and high temperature properties.

Rubber composition

Growing community of inventors

Tokyo, Japan

Toshihiro Nishimura